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- W2017751134 abstract "Using transgenic mice, we targeted SV40 T antigen and the bacterial neomycin resistance gene to steroidogenic tissues using a human P450 cholesterol side-chain cleavage promoter. Expression of SV40 T antigen resulted in adrenocortical tumors. Adrenocortical cell lines from one of these tumors (ST5R) was previously characterized. We have now obtained clonal lines from the second more differentiated tumor. After dispersion of the left adrenal tumor, ST5L parental cells were selected with G418 and subcloned. The resulting adrenocortical subcloned cell lines are more highly differentiated than those cell lines resulting from the right adrenal tumor (ST5R). ST5L cell lines secrete progesterone and corticosterone to varying degrees, whereas ST5R cells secrete only progesterone. One of the clonal cell lines, ST5Lc16, expresses both P450c11β and P450c11AS mRNAs, which normally are regionally distributed in different zones of the adrenal cortex. Thus, ST5Lc16 cells may be progenitor cells for both glomerulosa and fasciculata cells and may provide clues to the cellular and molecular events leading to the differentiation of the glomerulosa and the fasciculata-reticularis. Other ST5Lc cell lines are more representative of the fasciculata-reticularis, because they express P450c11β mRNA and secrete corticosterone, and they neither express P450c11AS mRNA nor do they secrete aldosterone. All cell lines also have 21-hydroxylase activity, but none express P450c21, indicating that some other, as yet unidentified, enzyme has this activity. In all cell lines, steroid secretion is regulable by cAMP stimulation but not by ACTH stimulation. All ST5L cell lines also express mouse renin-1 mRNA. In addition to their utility in studies of adrenal steroidogenesis, these cell lines may also be useful in studying the etiology of adrenocortical tumors." @default.
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- W2017751134 title "Characterization of adrenocortical cell lines produced by genetically targeted tumorigenesis in transgenic mice" @default.
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- W2017751134 doi "https://doi.org/10.1016/s0039-128x(96)00207-3" @default.
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